I have some dark discoloration on my penis. I showed it to my family doctor and he did some blood tests. He told me that there is nothing to be worried about it. But this concerns me a lot. I read a lot about penile cancers and figured discoloration as one of the early symptoms. I also came to know about other benign conditions like penile melanosis. Do I need to be worried? Do I need to consult a specialist? Do I require to do a biopsy? Is this a serious condition? I was diagnosed with psoriasis at the age of 32 and now I am 35 years old. Could this be an effect of psoriasis? Kindly advise.